‘And the anger of Yahweh was kindled against them, and he departed, and the cloud removed from over the Tent. And, behold, Miriam was skin-diseased, as white as snow. And Aaron looked on Miriam, and, behold, she was skin-diseased.'
And Yahweh's aversion to their behaviour was revealed by His next act, for in His ‘anger' (aversion to their sin) He departed and the pillar of cloud moved away from over the Tent. And then, when Aaron turned and looked at his sister, he saw that she was severely stricken with a skin disease that made her white as snow. We can only imagine the shock that they both experienced. Yahweh had rendered her ‘unclean'. Far from being a greater prophetess, she would now no longer be welcome at the door of the Tent of meeting, she would no longer be welcome in the camp. She would never again lead the women in singing and worship. Her days as a prophetess were over. She would live as an outcast, outside the camp, totally dependent on others for her survival. She had reaped a grim reward for her envy and covetousness.
Aaron's mind may possibly have flashed back to another occasion when he himself had been afflicted in the same way, when he was demonstrating God's signs to the elders on Moses' behalf (Exodus 4:30 with Exodus 4:6). But then it had only been temporary. He had known that Yahweh would put it right. This was different. This skin disease was permanent, and there was nothing that he could do about it. They must have looked at each other speechless with horror. She had been smitten by Yahweh. God had shown her the sinfulness of her heart in the most striking way possible, and had at the same time given a salutary lesson to Aaron.
Aaron was seemingly spared, probably partly because he had not been the instigator of the complaints, and partly because as High Priest his being rendered permanently unclean would have been a huge blow to Israel. Another High Priest would have had to be appointed (as later would be necessary, but not yet). And furthermore he did no doubt perform many useful services for Moses. Remembered also would be the fact that he had stood with Moses against Pharaoh. But he must have recognised what a close escape he himself had had. However, to his credit his concern was for Miriam.